/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.messaging.simp.broker;

import org.springframework.context.ApplicationEvent;

/**
 * Event raised when a broker's availability changes.
 *
 * @author Andy Wilkinson
 */
public class BrokerAvailabilityEvent extends ApplicationEvent {

    private static final long serialVersionUID = -8156742505179181002L;

    private final boolean brokerAvailable;


    /**
     * Creates a new {@code BrokerAvailabilityEvent}.
     *
     * @param brokerAvailable {@code true} if the broker is available, {@code}
     *                        false otherwise
     * @param source          the component that is acting as the broker, or as a relay
     *                        for an external broker, that has changed availability. Must not be {@code
     *                        null}.
     */
    public BrokerAvailabilityEvent(boolean brokerAvailable, Object source) {
        super(source);
        this.brokerAvailable = brokerAvailable;
    }

    public boolean isBrokerAvailable() {
        return this.brokerAvailable;
    }

    @Override
    public String toString() {
        return "BrokerAvailabilityEvent[available=" + this.brokerAvailable + ", " + getSource() + "]";
    }

}
